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Use pg_pwrite_zeros() in walmethods.c
This change impacts pg_receivewal and pg_basebackup, for the pre-padding with zeros of all the new non-compressed WAL segments, so as the code is more robust on partial writes. This makes the code consistent with the backend (XLogFileInitInternal) when wal_init_zeros is enabled for the WAL segment initialization. Author: Bharath Rupireddy Reviewed-by: Nathan Bossart, Andres Freund, Thomas Munro, Michael Paquier Discussion: https://postgr.es/m/CALj2ACUq7nAb7=bJNbK3yYmp-SZhJcXFR_pLk8un6XgDzDF3OA@mail.gmail.com
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